Add RDF/JSON Parsing Support to RIOT
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                 Key: JENA-127
                 URL: https://issues.apache.org/jira/browse/JENA-127
             Project: Jena
          Issue Type: New Feature
          Components: Jena, RIOT
         Environment: All
            Reporter: Rob Vesse
            Priority: Minor
         Attachments: RdfJsonRiotPatch.patch

The attached patch provides a RDF/JSON (Talis Specification) parser for RIOT, 
the patch is against ARQ trunk from the Jena SourceForge SVN repository

It plugins in as an implementation of LangRIOT (named LangRDFJSON) and uses the 
existing TokenizerJSON from the atlas package to do the tokenisation.  There is 
also a JenaReaderRdfJson added as part of this patch which does what the name 
suggests.

I have also included in this patch a set of unit tests which verify the parsers 
behaviour with a variety of valid and invalid inputs.

There are still some things to be addressed:
- The patch includes registration of the Jena reader when 
SysRiot.writeIntoJena() is called but does not unregister itself when 
resetJenaReaders() is called, should this be done?
- Add a RDF/JSON writer - a separate patch will be submitted at a later date 
(likely next week) for this

Otherwise the patch is fairly comprehensive and I hope can be reviewed and 
included in future releases

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